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F in (-oo:+oo)
F/45-(2/9) = 27 // - 27
F/45-(2/9)-27 = 0
F/45-2/9-27 = 0
1/45*F-245/9 = 0 // + 245/9
1/45*F = 245/9 // : 1/45
F = 245/9/1/45
F = 1225
F = 1225
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